Dinner at the Pool Room of the Four Seasons restaurant last night was a highlight. Considered the world's most beautiful restaurant, it was designed by Philip Johnson at the Seagram Building, which was opened in 1958, designed by Mies for Samuel Bronfman. Located on Park Avenue, the building and the restaurant within have both have come to symbolize the International Style in its most luxurious state. Working as the architect on site, Johnson was permitted to design the space, which has remained almost unchanged since construction, designated by the New York City Landmarks Preservation Commission as an interior landmark in 1989.